KR100405108B1 - fuel supply device for vehicles fuel gas and method thereof - Google Patents

Abstract

If the fuel pump does not operate in a vehicle injecting gaseous fuel into the liquid phase, the driver is notified of the current situation, and the fuel is supplied to the engine side by partial pressure of the fuel tank so that the vehicle can be moved to a repairable place without a separate transportation means. For example, a fuel tank for storing saturated fuel, an injector for injecting liquid fuel supplied from the fuel tank into the intake pipe of the engine according to the operating conditions, an injector provided between the return outlet of the injector and the fuel tank The pressure regulator which is opened when the fuel pressure supplied to the fuel tank exceeds the set value and is kept within the set value range, the pressure sensor which detects the pressure of the fuel supplied to the fuel tank and the injector, and the fuel tank detected by the pressure sensor. And the fuel pressure difference between the injector and the fuel pump It provides an electronic control device which determines that the engine is not operated and determines the injection amount of the fuel supplied to the injector by the partial pressure of the fuel tank and controls the engine to continue to operate.

Description

Fuel supply device for vehicles fuel gas and method

The present invention can notify the driver of the current situation when the fuel pump does not operate due to a mechanical defect of the motor or itself in a vehicle in which gas fuel is compressed and injected into the liquid phase, and the vehicle can be moved to a repairable place without a separate transportation means. The present invention relates to a fuel supply device for a gas fuel vehicle and a control method thereof.

In more detail, when the pressure of the fuel sent to the engine is lower than the set pressure value, it is determined that the fuel pump does not operate, and informs the driver of the current situation, and emergencyly supplies fuel to the engine by partial pressure of the fuel tank. The present invention relates to a fuel supply device for a gas fuel vehicle and a control method thereof, which enable a vehicle to be moved to a repair site.

As shown in FIG. 1, a fuel supply apparatus for a vehicle using gas fuel according to the related art includes a fuel tank 1 for storing fuel in a saturated state, and a fuel tank 1 driven by a motor 16. ), The fuel pump 2 for discharging the fuel in the liquid phase, and the injection amount required for the liquid fuel supplied from the fuel pump 2 through the supply passage 6 according to the operating conditions. And a pressure regulator 9 installed between the injector 7 for injecting the fuel and the return discharge port of the injector 7 and the fuel tank 1 to maintain the pressure value of the fuel supplied to the injector 7 within a set range. do.

According to the detected pressure value of the fuel detected by the pressure sensor 8 provided between the return discharge port of the injector 7 and the pressure regulator 9, the fuel pump 2 is used by the motor driver 13. An electronic controller 12 (ECU) is provided for controlling the rotation speed of the motor 16 and the fuel pump 2 to determine the injection amount of the injector 7 in accordance with the operating conditions.

Reference numeral 3 denotes a shut off & excess flow valve installed at the outlet side of the fuel tank 1 and closed when the engine E is stopped, and 5 denotes an overflow prevention shutoff valve 3 and an injector 7. Shut off valve (11), which is installed between the engines and stops when the engine (E) stops, 11 is a return valve to prevent backflow from the fuel tank (1).

Therefore, in the fuel supply device as described above, the liquid fuel discharged from the fuel tank 1 due to the driving of the fuel pump 2 when the engine E is operated by the main relay 14 is driven by the pressure regulator 9. Is increased by about 5 bar from the pressure value in the fuel tank 1, and when the pressure value of the fuel in the supply flow path 6 is higher than that, the fuel passes through the pressure regulator 9 and the return valve 11. Return to the tank (1).

However, in the fuel supply apparatus for a gas fuel vehicle according to the prior art, even when the driving signal is applied from the above-described motor driver 13, the motor 16 is not driven or the fuel pump at the time of driving the motor 16 ( If the fuel pump 2 installed inside the fuel tank 1 does not operate because 2) is not operated due to a mechanical defect, use a separate vehicle such as a wrecker on the road. Therefore, the driver has to go to a place where repair is possible, so that the driver has to suffer the time and economic loss of using the tow truck.

Accordingly, an object of the present invention is to inform the driver of the current situation when the fuel pump is not operated due to a defect in the motor or pump in the gas fuel vehicle, and to emergencyly supply fuel to the engine side by partial pressure of the fuel tank to the repair site. It is to provide a fuel supply device for a gas fuel vehicle, and a control method thereof, in which a separate transportation means is unnecessary as it moves.

Another object of the present invention is to provide a gas fuel vehicle for minimizing time and economic losses since the vehicle is repaired by moving the vehicle to a repair site without using a separate transportation means when the fuel pump breaks down. It is to provide a fuel supply device and a control method thereof.

1 is a schematic view of a fuel supply device for a gas fuel vehicle according to the prior art,

2 is a schematic view of a fuel supply device for a gas fuel vehicle according to the present invention;

3 is a flowchart illustrating a control method of a fuel supply device for a gas fuel vehicle according to the present invention.

* Explanation of symbols used in the main part of the drawing *

50; Fuel tank

51; Fuel pump

52; Supply line

53; Injector

54; Return discharge outlet

55; Pressure regulator

56,57; Pressure sensor

58; motor

59; Electronic controller

60; Return valve

The above object of the present invention is to provide a fuel tank for storing fuel in a saturated state, an injector for injecting liquid fuel supplied from the fuel tank into the intake pipe of the engine according to the operating conditions, a return discharge port of the injector and a fuel tank A pressure regulator installed between the pressure regulator that is opened and maintained within the set value range when the fuel pressure supplied to the injector exceeds the set value, a pressure sensor that detects the pressure of the fuel supplied to the fuel tank and the injector, and a pressure sensor. The fuel pressure difference between the fuel tank and the injector detected by the engine is compared and if the difference is smaller than the preset pressure value, the fuel pump is not operated and the driver is notified, and the fuel supplied to the injector by the partial pressure of the fuel tank Characterized in that the electronic control device for controlling the engine to drive continuously by determining the injection amount It is achieved by providing a fuel supply device for a gas fuel vehicle.

An object of the present invention described above is an injector for injecting a liquid fuel supplied from a fuel tank and a fuel tank to an intake pipe of an engine according to operating conditions, and a fuel provided between a return discharge port of the injector and a fuel tank to be supplied to the injector. Pressure regulator to maintain the pressure within the set value range, gas fuel provided with an electronic control device to determine the injection amount of the injector according to the operating conditions by controlling the rotational speed of the motor and fuel pump in accordance with the pressure value of the fuel supplied to the injector A control method for a vehicle fuel supply apparatus, comprising: a first step of detecting a pressure of fuel supplied to a fuel tank and an injector by a pressure sensor provided at a multi-valve and an injector return discharge port of a fuel tank; and detecting the fuel tank and the injector A second step of comparing and judging the estimated fuel pressure difference, and the fuel pressure difference value between the fuel tank and the injector is greater than the preset pressure value. A third step of determining that the fuel pump is in a failure mode in which the fuel pump does not operate and notifying the driver through a warning means, and determining the injection amount of the fuel emergencyly supplied to the injector by the partial pressure of the fuel tank so that the engine is continuously driven; And a fourth step of determining the injection amount of the injector according to the pressure value of the fuel supplied to the injector when the fuel pressure difference value between the fuel tank and the injector is larger than the preset pressure value. It is achieved by providing a control method of.

According to a preferred embodiment, the pressure sensor described above is provided at each of the multi-valve of the fuel tank and the return discharge port of the injector.

According to a preferred embodiment, the above-described fuel pump is provided with a warning means for operating by the control of the electronic control device to recognize the driver when the fuel pump does not operate.

According to a preferred embodiment, the failure of the motor driving the fuel pump in the failure mode keeps the pressure in the fuel tank and the injector the same.

According to a preferred embodiment, the injection amount of the injector in the failure mode is calculated based on the pressure in the fuel tank to extend the injection time of the injector.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to be described in detail to be easily carried out by those skilled in the art to which the present invention pertains, and thus the present invention It does not mean that the technical spirit and scope of the company is limited.

As shown in Figures 2 and 3, the fuel tank 50 for storing the fuel in a saturated state, and the liquid pump is supplied through the supply line 52 from the fuel tank 50 by driving the fuel pump 51 Fuel supplied to the injector 53 provided between the injector 53 for injecting fuel into the intake pipe of the engine E and the return discharge port 54 of the injector 53 and the fuel tank 50. If the pressure Pi exceeds the set value, the pressure regulator 55 is opened and maintained within the set value range, and the return outlet of the multi valve A and the injector 53 of the fuel tank 50 is maintained. And pressure sensors 56 and 57 provided at 54 to detect the pressures Pt and Pi of the fuel, respectively.

Comparing the fuel pressure difference Pi-Pt on the fuel tank 50 and the injector 53 side detected by the above-described pressure sensors 56 and 57, the difference value is a preset pressure value (for example, about 5 bar). If less than the fuel pump 51 is determined not to operate by notifying the driver through a warning means such as a buzzer or lamp 64, the emergency supply to the injector 53 by the partial pressure of the fuel tank 50 An electronic control unit 59 is provided to determine the injection amount of the fuel and control the engine E to continuously drive.

Reference numeral 58 denotes a motor for driving the fuel pump 51, 60 denotes a passage for returning excess fuel passing through the pressure regulator 55, and a return valve for preventing backflow from the fuel tank 50, 65 denotes An overflow prevention shutoff valve installed at the outlet side of the fuel tank 50 and closed when the engine E is stopped, 66 is a shutoff valve closing the supply line 52 when the engine E is stopped.

Hereinafter, a method of using a fuel supply device for a gas fuel vehicle and a control method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 2 and 3, the liquid phase is supplied from the fuel tank 50 to the injector 53 due to the driving of the fuel pump 51 when the motor 58 is operated by driving the main relay 63. The fuel is increased by about 5 bar from the pressure value Pt in the fuel tank 50 by the pressure regulator 55. At this time, when the pressure value Pi of the fuel supplied to the injector 53 rises above that, the pressure is increased. It returns to the fuel tank 50 via the regulator 55 and the return valve 60.

According to the pressure value of the fuel detected by the pressure sensor 57 provided between the return discharge port 54 and the pressure regulator 55 of the injector 53 described above, the electronic controller 59 uses the fuel of the injector 53. Since the injection time is determined to drive the injector 53, the vehicle can operate.

In this case, when the fuel pump 51 does not operate normally in the fuel supply device for a gas fuel vehicle as described above, the electronic control device 59 uses the partial pressure of the fuel tank 50 to perform emergency measures after self-diagnosis. As the fuel of the tank 50 is supplied to the injector 53, the vehicle can be temporarily moved to a place where the vehicle can be repaired without using a separate moving means.

On the other hand, the above-described fuel pump 51 does not operate normally, the first is the case where the motor 58 does not drive even when applying a drive signal from the motor driver 62 to the motor 58, the second is The motor 58 is classified as a case where the fuel pump 51 does not drive due to its own defect or the like even when the motor 58 is normally driven.

That is, when the above-described fuel pump 51 operates normally, the pressure value Pi of the injector 53 detected by the pressure sensor 57 is in the fuel tank 50 detected by the pressure sensor 56. It is equal to the pressure value Pt plus the set pressure value (about 5 bar) discharged by the fuel pump 51.

That is, (Pi) = (Pt + 5bar).

On the other hand, when the above-described fuel pump 51 does not operate normally, the injector 53 than the pressure value Pt of the fuel tank 50 and the set pressure value (5 bar) of the fuel pump 51 are added. It can be seen that the pressure value Pi of) is small.

That is, (Pi) <(Pt + 5bar).

Therefore, when the fuel pump 51 does not operate normally,

It can be seen that (5 bar) ≥ (Pi-Pt).

On the other hand, the pressure value Pt in the fuel tank 50 detected by the pressure sensor 56 provided in the multi-valve A of the fuel tank 50 mentioned above, the return discharge port 54 of the injector 53, The pressure value Pi of the fuel supplied to the injector 53 detected by the pressure sensor 57 provided between the pressure regulators 55 is continuously detected and the detection signal is input to the electronic controller 59 ( See S10).

The above-described electronic controller 59 compares and determines the difference between the pressure value Pi detected by the pressure sensor 57 and the pressure value Pt detected by the pressure sensor 56 (see S20). .

When these pressure difference values Pi-Pt are smaller than the set pressure value 5bar [(5bar)> (Pi-Pt)], the fuel pump 51 described above does not operate normally in the electronic controller 59. Diagnose in the failure mode (fail mode) by notifying the driver of the failure mode through the warning means such as the lamp 64, and by stopping the driving of the motor 58 through the motor driver 62 as described above injector ( The pressure value Pi supplied to 53 and the pressure value Pt of the fuel tank 50 become equal (see S30).

In the case where the above-described fuel pump 50 does not operate normally, the electronic control unit 59 switches the driving condition of the injector 53 to the failure mode, and changes the injection time of the injector 53 to the fuel tank 50. It is possible to continuously drive the engine E by extending it according to the injection amount determined based on the pressure Pt (see S40).

That is, even when the above-described fuel pump 51 does not operate, the liquid fuel in the fuel tank 50 may be supplied to the injector 53 by using the partial pressure of the fuel tank 50.

On the other hand, when the difference value Pi-Pt of the pressure value Pi of the injector 53 and the pressure value Pt of the fuel tank 50 is equal to or larger than the set pressure value 5bar [(5bar ) ≤ (Pi-Pt)], the electronic controller 59 diagnoses the above-described fuel pump 51 as a normal mode (normal mode) in normal operation, and in accordance with the pressure value of the fuel supplied to the injector 53 The injection amount of the injector 53 is determined (see S50).

As described above, when the fuel pump 51 does not operate normally, the electronic control unit 59 self-diagnoses as a failure mode and continuously supplies fuel to the injector 53 using the partial pressure of the fuel tank 50. Thus, the vehicle can be operated to a place where it can be maintained.

As mentioned above, according to a preferable embodiment, it has the following advantages.

If the fuel pump fails to operate due to a defect in the motor or pump in the gas fuel vehicle, the driver is notified of the current situation, and a separate transportation means is provided by supplying the fuel to the engine with partial pressure of the fuel tank and moving the vehicle to the repair site. This becomes unnecessary.

In addition, when a fuel pump breaks down in a gas fuel vehicle, the vehicle is moved to a repair site without a separate transportation method, thereby receiving repair work, thereby minimizing time and economic losses.

Claims (6)

A fuel tank for storing fuel in a saturated state; An injector for injecting liquid fuel supplied from the fuel tank to an intake pipe of an engine according to an operating condition; A pressure regulator installed between the return discharge port of the injector and the fuel tank, the pressure regulator being opened when the pressure of the fuel supplied to the injector exceeds a set value and maintained within a set value range; A pressure sensor for detecting pressure of the fuel supplied to the fuel tank and the injector, respectively; And Comparing the fuel pressure difference between the fuel tank and the injector detected by the pressure sensor, if the difference is smaller than the preset pressure value, it is determined that the fuel pump is not operating and informs the driver, and the partial pressure of the fuel tank And an electronic controller for determining the injection amount of the fuel emergencyly supplied to the injector to control the engine to be continuously driven. The fuel supply device for a gas fuel vehicle according to claim 1, wherein the pressure sensor is installed at a multi-valve of the fuel tank and a return discharge port of the injector, respectively. The fuel supply device for a gas fuel vehicle according to claim 1, further comprising a warning means for operating the fuel pump when the fuel pump does not operate to recognize the driver. It is installed between the fuel tank, the injector that injects liquid fuel supplied from the fuel tank to the intake pipe of the engine according to the operating conditions, the return discharge port of the injector and the fuel tank to maintain the pressure of the fuel supplied to the injector within the set value range. The control method of the fuel supply device for a gas fuel vehicle having a pressure regulator, an electronic control device for controlling the rotation speed of the motor and the fuel pump according to the pressure value of the fuel supplied to the injector to determine the injection amount of the injector according to the operating conditions In: Detecting a pressure of the fuel supplied to the fuel tank and the injector by a pressure sensor provided at each of the multi-valve of the fuel tank and the injector return discharge port; A second step of comparing and determining the detected fuel pressure difference between the fuel tank and the injector; If the fuel pressure difference between the fuel tank and the injector is smaller than a preset pressure value, the fuel pump is determined to be in a failure mode in which the fuel pump does not operate, and the driver is notified through a warning means, and the partial pressure of the fuel tank to continuously drive the engine. A third step of determining an injection amount of the fuel emergencyly supplied to the injector; And And a fourth step of determining the injection amount of the injector according to the pressure value of the fuel supplied to the injector when the fuel pressure difference value between the fuel tank and the injector is equal to or greater than a preset pressure value. Control method of a fuel supply device for a fuel vehicle. The method of controlling a fuel supply device for a gas fuel vehicle according to claim 4, wherein in the failure mode, the power of the motor driving the fuel pump is cut off to maintain the same pressure in the fuel tank and the injector. The method of controlling a fuel supply device for a gas fuel vehicle according to claim 4 or 5, wherein the injection time of the injector is extended by calculating the injection amount of the injector in the failure mode based on the pressure in the fuel tank.